Please note this is taken from :
Islam and the Signs of the Last Day
Please do not confuse Imam Mahdi with Hadhrat Isa (Jesus) Alayhis Salaam. They are two different persons, and both will come during the last days. According to Hadeeth, Imam Mahdi will appear first, and Hadhrat Isa (A.S.) will appear during Imam Mahdi's lifetime. Furthermore, only Hadhrat Isa (A.S.) will be able to kill Dajjal (the "anti-Christ").
The Physical Features of Hadhrat Isa (A.S.)
He will resemble the famous companion of the prophet (A.S.) Hadhrat Urwa bin Masoodi (R.A.). He will be of average height and red and white in colour. His hair spread to the shoulders, straight, neat and shining as after a bath. On bending his head, it will seem as if pearls are falling. He will have an armour on his body. He will be wearing two pieces of cloth light yellow in color.
His Descension
He will descend on a Jamaat (group) that will be righteous at the time and comprising of 800 men and 400 women. The people will be preparing for war at the time against Dajjal (the anti-Christ). It will be time for Fajr (morning) prayers, and Imam Mahdi will be the Amir (leader). From the darkness of the dawn, a sound will suddenly be heard that "one who listens to your pleas has come" -- the righteous people will look everywhere and their eyes will fall on Jesus (A.S.). Briefly, at the time of Fajr, Jesus (A.S.) will descend. When descending, Jesus (A.S.)'s hands will be on the shoulders of two angels (according to another source (Kab Abrar), a cloud will carry him). On their insistence Hadhrat Jesus will introduce himself. He will inquire about their enthusiasm and thoughts on Jihad against Dajjal. Hadhrat Jesus (A.S.) will descend at the white minaret of the Grand Umayyad Mosque of Damascus by Imam Mahdi. At the time Imam Mahdi will have proceeded forward to lead the Fajr Salaat (prayers). The Iqamat (second call to prayers) of the Salaat would have been said (already recited) and Imam Mahdi will call Hadhrat Jesus (A.S.) for Imamat (to lead the prayer), but he (Hadhrat Jesus (A.S.)) will instead tell Imam Mahdi to lead the prayer since the Iqamat of that Salaat has already been said for him. Thus Imam Mahdi will lead the prayer, and Hadhrat Jesus (A.S.) will follow him. After the ruku (bowing), he will make this statement: "Allah has killed Dajjal and the Muslims have appeared."
The Killing of Dajjal and the Victory of the Muslims
After the completion of Fajr Salaat, Hadhrat Jesus (A.S.) will open the door behind him where Dajjal accompanied by 70,000 Jews will be. He will indicate with his hand to move away between him (Hadhrat Jesus (A.S.)) and Dajjal. Dajjal will then see Hadhrat Jesus(A.S.). At that time every Kafir on whom the breath of Hadhrat Jesus (A.S.) will reach, will die. His breath will reach up to the distance of his eyesight. The Muslims will then come down from the mountains and break loose on the army of Dajjal. There will be war, Dajjal will retreat, and Hadhrat Jesus (A.S.) will pursue Dajjal. Hadhrat He will kill Dajjal at the Gate of Hudd. He willl show the Muslims the blood of Dajjal. Eventually the Jews will be selected and killed. The swine will be killed and the cross broken. People will revert to Islam. Wars will end, and people will return to their respective countries. One Jamaat (group) of Muslims will remain in his service and companionship.
Hadhrat Jesus (A.S.) will go to Fajr Rawha and perform Haj or Umrah (or both) from there. He will also go to the grave of Rasulullah (prophet Muhammad) and present his greetings and Rasulullah (Sallallahu Alayhi Wasallam) will reply. People will live comfortable lives. The wall of Yajooj and Majooj (Gog and Magog) will then break.
The Blessings of Hadhrat Jesus (A.S.)
1 Hadhrat Jesus (A.S.) will descend and stay on earth.
2 His descension will be in the last era of the Ummat (muslim nation).
3 He will be a just ruler and a fair judge.
4 His ummat (nation) will be the Khalifa (deputies) of Rasulullah (prophet Muhammad).
5 He will act himself and instruct others on the Qur'an and Hadith (Shariat of Islam).
6 He will lead people in Salaat (muslim prayers).
7 He will stay on earth for a period of 40 years after descending. The will be the best era of the Ummat (muslim nation) after the first era of Islam.
8 Allah will protect his companions from Hell.
9 Those who will save the Religion of Islam by associating themselves with Hadhrat Jesus(A.S.) will be amongst the most loved by Allah Ta'ala.
10 During this period all other religions and mazhabs (sects and philosophies) besides Islam will perish, hence there will be no kuffaars (infidels) in the world.
11 Jihad will be stopped.
12 No Khiraaj will be taken.
13 Nor Jizya (protection) tax from the kafirs (unbelievers).
14 Wealth and property will be in surplus to such an extent that there will be no one to accept the wealth of the other (everyone will be independent).
15 Receiving Zakaat and Saadaqa (charity) will be discarded.
16 The people will love the sajda (prostration) more than the world and what it consists of.
17 All types of Deeni (religious) and worldly blessings will descend on earth (many halaal (lawful) things will be created).
18 There will be peace, harmony and tranquility during the time of Hadhrat Jesus (A.S.)'s stay in the world.
19 There will be no animosity for a period of seven years, even between two persons.
20 All hearts will be free from miserliness, envy, hatred, malice and jealousy.
21 For a period of forty years no one will fall ill or die.
22 Venom will be taken out of all venomous animals.
23 Snakes and scorpions will not harm anyone to the extent that if a child put his hand in its mouth, he will not be harmed.
24 Will animals will not harm anyone.
25 If a man will pass a lion, he will not be troubled or harmed, or even if any girl will open its mouth to test if it will do anything.
26 The camels will graze among lions, cheetahs with cattle and the jackals with goats.
27 The fertility of the land will increase to such an extent that even if a seed is planted in a hard rock, it will sprout.
28 A pomegranate will be so huge that a jamaat (group) will be able to eat it and the people will use its peel as shade.
29 There will be so much barakaat (blessing) in milk that a camel will suffice for a huge jamaat (group) , a cow for a tribe and a goat for a family.
30 In short, life will be most pleasant after the descension of Hadhrat Jesus (A.S.).
His Marriage, Death and Deputies
After his descension on earth, Hadhrat Jesus (A.S.) will marry. He will have children, and he will remain on earth 19 years after marriage. He will pass away and Muslims will perform his Janaza Salaat (funeral payers) and bury him net to Rasulullah (prophet Muhammad). (Tirmidhi)
from: "Major Signs of Qiyamat"
translated by M. Afzal Hoosein Elias
from the original (with references): "Aalalaat-e-Qiyyamat aur Nuzul-e-Eesa."
